Maximising spectral efficiency in 3G with hybrid ad-hoc UTRA TDD/UTRA FDD cellular mobile communications

A novel strategy is presented to maximise spectral efficiency in 3rd generation (3G) wireless communications. This strategy involves, first, permitting peer-to-peer UTRA TDD communication, in the under-utilised UTRA FDD uplink, at the edges of UTRA FDD cells. Consequently, a novel medium-access-control protocol, denoted as channel-sensing TDMA TDD, is employed to efficiently co-ordinate the peer-to-peer UTRA TDD communication. Channel-sensing TDMA TDD employs a modified busy-tone broadcast/channel-sensing mechanism to avoid and mitigate high interference scenarios. Results show significant improvements in system capacity and spectral-efficiency from the application of this novel approach in 3G.

[1]  Harald Haas,et al.  A capacity investigation on UTRA-TDD utilising underused UTRA-FDD uplink resources , 1999 .

[2]  Elvino S. Sousa,et al.  Feasibility study of TDD- and FDD-CDMA frequency sharing cellular networks , 1998, ICUPC '98. IEEE 1998 International Conference on Universal Personal Communications. Conference Proceedings (Cat. No.98TH8384).

[3]  Harald Haas,et al.  Capacity Analysis of a TDD Underlay Applicable for UMTS , 1999 .

[4]  Chung Gu Kang,et al.  Capacity analysis of TDD cell sharing underutilized FDD uplink , 2001, IEEE VTS 53rd Vehicular Technology Conference, Spring 2001. Proceedings (Cat. No.01CH37202).

[5]  Li-Chun Wang,et al.  A hierarchical TDD microcell/FDD macrocell CDMA system using antenna arrays and power ratio adjustments , 2002, Global Telecommunications Conference, 2002. GLOBECOM '02. IEEE.